Some ameliorations may be possible in cfg,
to try :windowresolution=1024x768output=opengl
more memory :memsize=63
to try also, even with risk of deformations, game dependent :aspect=false
I found better graphics and speed with the following :scaler=none
Also important for speed :core=dynamiccycles=auto
what can resolve a sound problem :sbmixer=false
for keyboard some layouts

for the dosbox.bat in Recalbox, does this translate to;-
imgmount d .\cd\pptime/pptime.cue -t iso
c:
@cd pptime
@cls
@pinball
as for some reason im struggling to even run the program now!

Well you have to have the right path, what you wrote is nonsense. Your game should be in a pptime.pc folder I suppose, and then you must have the right path to everythign you use.
You can use the pause command to debug your dosbox.bat file

Some ameliorations may be possible in cfg,
to try :
windowresolution=1024x768
output=opengl
more memory :
memsize=63
to try also, even with risk of deformations, game dependent :
aspect=false
I found better graphics and speed with the following :
scaler=none
Also important for speed :
core=dynamic
cycles=auto
what can resolve a sound problem :
sbmixer=false
for keyboard some layouts

german :
keyboardlayout=de129
french :
keyboardlayout=fr120 (fr189)
english :
keyboardlayout=us103

well sadly this doesn't change anything, the game is working the same, passing sbmixer from true to false just adds musics which weren't playing before, but the sound is still awfull/laging

@voljega
Therefore I wrote "may be"
Some games will never play in full speed on Raspberry, so I cannot understand for what reason it should run better on Retropie, based on Debian ? Perhaps an older Dosbox version ?

Sound is ok in my case, also the background CD tracks plays quite well. The issue I have is, that the game in general runs to slow. It seems the (emulation) speed from an RPi3 is too slow for such a late dosgame as Timeshock is.
In my case, I have 10-15 fps max. I tried to optimize a lot in settings, but I don't get it really smooth.

As from my experience, the last generation of triple A dosgames from 1994 onwards (especially 3D games) are too advanced for the RPi3.

As you already said above, it's also not possible to run the PSX version of Timeshock. I got it working on Retropie, but what I remember, they offer a second emulator core for PSX, with which it has worked.
But as the recalbox team is doing such a good job in general and also with the fast update intervals, maybe a further update will bring us on Recalboxos also a second (for ARM) or updated emulator core for the PSX, which covers the incompatible games.